Email send problem

[Milance]

I can not send mail from the administrator panel anybody.
Maintenance/Diagnostics/email I get e mail with the following message

vBulletin Email Test (With -f Parameter)
You are receiving this email because your email address was entered as an email test at Test Forum.

The first step of this email test script has been completed. However, a formatting test is still necessary:

A paragraph break.
A single line break.

Another paragraph break.
Another single line break.
Another single line break.

If the above lines look correct, you are finished. The email features on your server are setup correctly.
If this email is run together on one line, there is possibly a configuration error with your mail server. Please ensure it is configured correctly.

Important. I use 4.2.3 vbulletin.
For version 4.1.6 I send slave mail. No problem if you send.

Please help.